| 1. | The crack eventually caused the chord to fracture .
裂纹最终致使弦杆断裂。 |
| 2. | Machining of main chord of tower crane by c630 lathe
630车床成组加工塔机主弦杆 |
| 3. | Carried on the optimized design using the optimized design module to the support , finally changed to 14 equal - angle iron to replace the used steel
利用优化设计模块对支架进行了优化设计，结果改用14号等边角钢代替原主弦杆用钢。 |
| 4. | For the overlapped joint with greater ( ratio of flank rod thickness to chord rod thickness ) , the ductility of the joint subject to repeated loading was more deteriorated
对于搭接节点（腹杆与弦杆壁厚比值）值较大时，节点承受反复荷载时的延性较差。 |
| 5. | It is also found from the tests that the ultimate capacity of connection is greatly affected by the ratio of the width of branch to that of chord , the thickness of chord and the angle between chord and branch
试验结果显示，节点的承载能力与腹杆和弦杆的宽度比、弦杆的壁厚、腹杆和弦杆夹角密切相关。 |
| 6. | Taking thickness of web members and main chords as design variables and the lightest weight of crane booms as objective junction , considering constraints of rigidity and stability etc . , this paper establishes the math model of optimal design
摘要选取起重机臂架的腹杆壁厚和各节臂架的主弦杆壁厚为设计变量，以最小重量为优化目标，考虑刚度和稳定性等约束条件，建立优化数学模型。 |
| 7. | 4 ) the different between global ductility gained using fully restrained model for truss connections and partial restrained model for truss connections indicate the fully restrained is better for the global ductility of the staggered truss steel framing
5 )通过桁架采用不同连接计算模型的比较，指出在钢结构交错桁架的制作中，无论是混合桁架体系还是空腹桁架体系，都希望能够保证桁架腹杆与弦杆的可靠连接。 |
| 8. | The possible shear of the upper chord will change beam from flexural member to member under flexure and compression force . this is emphasised through design example . as a result ， we find that composite floor system is good for reducing the height of floor system
在组合楼盖体系设计中，笔者指出，可能的桁架弦杆剪力会使作为桁架弦杆侧向支承的梁由弯曲构件变为压弯构件，这是在与桁架体系相适应的楼盖体系设计中应该注意的一个环节。 |
| 9. | The working mechanism of shear connector of the staggered - truss system between reinforced concrete plank and steel chord was analyzed based on theoretical analysis and value computational methods , and details such as reasonable styles , types and quantity of the shear connector were introduced via a calculated example
摘要为推广应用钢结构交错桁架体系，采用理论分析及数值计算方法，分析了交错桁架结构楼板与钢弦杆连接的抗剪连接件的工作机理。 |
| 10. | Among the design of the truss system , it is deeply analyzed that the thought of choosing truss system type , the difficulties in designing truss system and their solutions , the constrain of column to truss chord deformation and the chord modified coefficients used in this case
在桁架体系设计中，笔者主要分析了桁架体系的选型思路；提出了桁架体系的设计难点，并给出了解决方案；分析了柱子约束对桁架弦杆受力的影响，并给出了在手算桁架体系杆件受力时所需要的弦杆内力修正系数。 |
