问题 单项选择题

某宽厚板车间冷库区为三跨等高厂房,跨度均为35m,边列柱柱间距为10m,中列柱间距20M,局部60M,采用三跨连续式焊接工字形屋架,其间距为10m,屋面梁与钢柱为固接,厂房屋面采用彩色压型钢板,屋面坡度为1/20,檩条采用多跨连续式H型钢檩条,其间距为5m,檩条与屋面梁搭接。屋面梁、檩条及屋面上弦水平支撑的局部布置示意如图(a)所示,且系杆仅与檩条相连。中列柱柱顶设置有20m和60m跨度的托架,托架与钢柱采用铰接连接,托梁的简图和荷载设计值如图(b)、(c)所示,屋面梁支撑在托架竖杆的侧面,且屋面梁的顶面略高于托架顶面约150mm。檩条、屋面梁、20m跨度托架,采用Q235钢,60m托架采用Q345B钢,手工焊接时,分别用E43、E50,焊缝质量等级二级。20m托架采用轧制T型钢,T型钢翼缘板与托架平面垂直,60m托架杆件采用轧制H型钢,腹板与托架平面相垂直。

60m托架端斜杆D1的轴心拉力设计值(kN),与下列何项数值最为接近?()

A.2736

B.2757

C.3340

D.3365

答案

参考答案:C

解析:

解答如下:

利用节点法,∑YA=0,则

D1=(1930-0.5×30)×1.744=3339.76kN

单项选择题 A3/A4型题
单项选择题

The telecommunications, pharmaceutical, and airline industries all have undergone radical changes in recent years. Pharmaceutical companies, which once sold drugs to the doctors that dispensed them, switched to the solution-selling method and started dealing with health-care companies. And many major airlines consolidated at the same time that low-cost firms like Jet Blue entered the market.

In each of these industries, the game changed, and with new rules came new ways to win. That is the premise of Harvard Business School’s "Changing the Game. Negotiation and Competitive Decision Making." The program, which covers not only deal-making but also topics as diverse as online auctions and strategic partnerships, "is for companies that are going through fundamental change in the way things are done," says Max Bazerman, program chair and professor of business administration at the school.

This is not a program for novices, says Bazerman; most participants have already attended a general negotiation program. In "Changing the Game," participants learn to understand their thought processes regarding negotiation, to compare rational and intuitive decision-making strategies, and to identify common mistakes made by even the most experienced professionals. By focusing on competitive environments, the program draws on some of the most advanced concepts from the emerging areas of behavioral economics, behavioral decision research, and behavioral finance.

Participants engage in simulated negotiations that highlight the tension between creating and assessing value, and learn how to think about both simultaneously. The soup-to-nuts simulations encompass preparation, team building, negotiating, and feedback, as well as the development of a conceptual structure for thinking about negotiations more rationally. Participants then apply that structure in their critiques of several large-scale negotiation cases. Ultimately participants apply their newly-honed analytic skills to their own companies and critique of past negotiations.

Negotiations can take many forms, of course. Bazerman notes that auctions are becoming increasingly common. Thanks to a renewed focus on driving clown costs, auctions have emerged as a valuable way for buyers to exert maximum leverage (although the course offers advice to sellers as well). Here again, coursework focuses both on analysis of case studies and on simulations that give participants a chance to roll up their sleeves and put themselves to the test.

"Max’s approach is more pragmatic than other programs I’ve taken," says Gerry Dully, senior vice president of global marketing and logistics at Methanex, a producer of methanol based in Vancouver. "Looking at my prior experience, I could see what mistakes I made, and I’m more conscious of them now. The course had a profound impact on how I’ve modified my behavior in negotiating situations.

The word "novice" (first sentence, Para. 3) probably refers to()

A. a person with no previous experience

B. an ordinary employee in a company

C. a specific strategy for business negotiation

D. a professional negotiator for a company